const env = {
     //aliyun OSS config
    uploadImageUrl: 'https://shejihm.oss-cn-beijing.aliyuncs.com/', // 默认存在根目录，可根据需求改
    AccessKeySecret: '42dCYSaloRQUNj2JqU7PXVPNlpSDpd',        // AccessKeySecret 去你的阿里云上控制台上找
    OSSAccessKeyId: 'LTAI5tHfBSBPxCiw1UGGJzMq',         // AccessKeyId 去你的阿里云上控制台上找
    timeout: 20000 //这个是上传文件时Policy的失效时间
} 

// const base64 = require('./base64.js'); //Base64,hmac,sha1,crypto相关算法
// require('./hmac.js');
// require('./sha1.js');
// const Crypto = require('./crypto.js');
import base64 from './base64.js'
import './hmac.js'
import './sha1.js'
import Crypto from './crypto.js'

/*
 *上传文件到阿里云oss
 *@param - filePath :图片的本地资源路径
 *@param - dir:表示要传到哪个目录下
 *@param - successc:成功回调
 *@param - failc:失败回调
 * Suffix 后最名称
 */
const uploadFile = function({filePath, dir, name,}) {
  return new Promise((resolve, reject) => {
    if (!filePath || filePath.length < 9) {
    	uni.showModal({
    		title: '图片错误',
    		content: '请重试',
    		showCancel: false,
    	})
    	return;
    }
    
    //图片名字 可以自行定义，     这里是采用当前的时间戳 + 150内的随机数来给图片命名的
    const aliyunFileKey = dir + new Date().getTime() + Math.floor(Math.random() * 150)  + name;
    
    const aliyunServerURL = env.uploadImageUrl; //OSS地址，需要https
    const accessid = env.OSSAccessKeyId;
    const policyBase64 = getPolicyBase64();
    const signature = getSignature(policyBase64); //获取签名
    
    uni.uploadFile({
    	url: aliyunServerURL, //开发者服务器 url
    	filePath: filePath, //要上传文件资源的路径
    	name: 'file', //必须填file
    	formData: {
    		'key': aliyunFileKey,
    		'policy': policyBase64,
    		'OSSAccessKeyId': accessid,
    		'signature': signature,
    		'success_action_status': '200',
    	},
    	success: function(res) {
    		// console.log('222',res);
    		if (res.statusCode != 200) {
    			reject(new Error('上传错误:' + JSON.stringify(res)))
    			return;
    		}
    		resolve(aliyunServerURL + aliyunFileKey);
    	},
    	fail: function(err) {
			console.log('err', err)
    		err.wxaddinfo = aliyunServerURL;
    		reject(err);
    	},
    })
  });
	
}

const getPolicyBase64 = function() {
	let date = new Date();
	date.setHours(date.getHours() + env.timeout);
	let srcT = date.toISOString();
	const policyText = {
		"expiration": srcT, //设置该Policy的失效时间，超过这个失效时间之后，就没有办法通过这个policy上传文件了 
		"conditions": [
			["content-length-range", 0, 2000 * 1024 * 1024] // 设置上传文件的大小限制,5mb
		]
	};

	const policyBase64 = base64.encode(JSON.stringify(policyText));
	console.log(policyBase64);
	return policyBase64;
}

const getSignature = function(policyBase64) {
	const accesskey = env.AccessKeySecret;

	const bytes = Crypto.HMAC(Crypto.SHA1, policyBase64, accesskey, {
		asBytes: true
	});
	const signature = Crypto.util.bytesToBase64(bytes);
	console.log(signature);
	return signature;
}

// module.exports = uploadFile;
export {
	uploadFile,
	getPolicyBase64,
	getSignature,
}
